MX321 is a three phase sensed Automatic Voltage Regulator and the forms part of excitation system for brush-less generator.

sensing input
Voltage           190-264 ac max, 2 or 3 phase
Ferquency       50-60Hz nominal
power input(PMG)
Voltage           170-220 ac max,3 phase, 3 wire
Current           3A/phase
Frequency       100-120Hz nominal
output
voltage            max 120V dc
Current           continuous 3.7A
                      intermittent 6A fo